On Mon, Feb 11, 2019 at 06:42:29PM +0100, Niclas Zeising wrote:
> On 2/11/19 6:36 PM, Steve Kargl wrote:
> > 
> > The patch allows the port to be built.
> > 
> > kldloading the i915kms module causes a 'black screen
> > of death'
> > 
> > I'll note that there seems to be a race condition in
> > booting a kernel (with or without the drm2 stuff).
> > During boot the kernel hangs (see below) :
> > 
> > FreeBSD/SMP: Multiprocessor System Detected: 2 CPUs
> > FreeBSD/SMP: 1 package(s) x 2 core(s)
> > Firmware Warning (ACPI): Incorrect checksum in table [TCPA] - 0x80, should 
> > be 0x24 (20190108/tbprint-337)
> > ioapic0: Changing APIC ID to 2
> > ioapic0 <Version 2.0> irqs 0-23 on motherboard
> > Launching APs: 1
> > 
> > *** kernel hangs here sometimes ***
> > 
> > Timecounter "TSC" frequency 1995048460 Hz quality 1000
> > random: entropy device external interface
> > kbd1 at kbdmux0
> I assume you load the kernel module either manually with kldload or 
> using kld_list in rc.conf, not by loading it from the loader?

After a succesful boot.  I login as root and manually kldload
the i915kms module.

> So there is two bugs?  One bug is that the kernel hangs while booting, 
> and the other is that you get a black screen when loading the drm module 
> after the kernel is mostly done booting?

Yes, two bugs.  kernel sometimes hangs after lauching the cpus but 
before random device is ready.  Loading the new drm2 module cause
a black screen of death.  Don't know if it helps.  Extracted info
from /var/log/messages

login[987]: ROOT LOGIN (root) ON ttyv0

(manually kldload i915kms.ko module)

kernel: info: [drm] Initialized drm 1.1.0 20060810
kernel: drmn0: <Intel i965GM> on vgapci0
kernel: intel_iicbb0 on drmn0
kernel: iicbus0: <Philips I2C bus> on iicbb0 addr 0x30
kernel: iic0: <I2C generic I/O> on iicbus0
kernel: iicbus1: <Philips I2C bus> on intel_gmbus0
kernel: iic1: <I2C generic I/O> on iicbus1
kernel: intel_iicbb1 on drmn0
kernel: iicbus2: <Philips I2C bus> on iicbb1 addr 0x30
kernel: iic2: <I2C generic I/O> on iicbus2
kernel: iicbus3: <Philips I2C bus> on intel_gmbus1
kernel: iic3: <I2C generic I/O> on iicbus3
kernel: intel_iicbb2 on drmn0
kernel: iicbus4: <Philips I2C bus> on iicbb2 addr 0x30
kernel: iic4: <I2C generic I/O> on iicbus4
kernel: iicbus5: <Philips I2C bus> on intel_gmbus2
kernel: iic5: <I2C generic I/O> on iicbus5
kernel: intel_iicbb3 on drmn0
kernel: iicbus6: <Philips I2C bus> on iicbb3 addr 0x30
kernel: iic6: <I2C generic I/O> on iicbus6
kernel: iicbus7: <Philips I2C bus> on intel_gmbus3
kernel: iic7: <I2C generic I/O> on iicbus7
kernel: intel_iicbb4 on drmn0
kernel: iicbus8: <Philips I2C bus> on iicbb4 addr 0x30
kernel: iic8: <I2C generic I/O> on iicbus8
kernel: iicbus9: <Philips I2C bus> on intel_gmbus4
kernel: iic9: <I2C generic I/O> on iicbus9
kernel: intel_iicbb5 on drmn0
kernel: iicbus10: <Philips I2C bus> on iicbb5 addr 0x30
kernel: iic10: <I2C generic I/O> on iicbus10
kernel: iicbus11: <Philips I2C bus> on intel_gmbus5
kernel: iic11: <I2C generic I/O> on iicbus11
kernel: vgapci0: attempting to allocate 1 MSI vectors (1 supported)
kernel: msi: routing MSI IRQ 34 to local APIC 1 vector 55
kernel: vgapci0: using IRQ 34 for MSI
kernel: info: [drm] MSI enabled 1 message(s)
kernel: info: [drm] Supports vblank timestamp caching Rev 1 (10.10.2010).
kernel: info: [drm] Driver supports precise vblank timestamp query.
kernel: composite sync not supported
kernel: intel_sdvo_ddc_proxy397632 on drmn0
kernel: intel_sdvo_ddc_proxy397632: detached
kernel: intel_sdvo_ddc_proxy397664 on drmn0
kernel: intel_sdvo_ddc_proxy397664: detached
kernel: drmn0: taking over the fictitious range 0xe0000000-0xf0000000
kernel: info: [drm] initialized overlay support
kernel: info: [drm] Connector LVDS-1: get mode from tunables:
kernel: info: [drm]   - kern.vt.fb.modes.LVDS-1
kernel: info: [drm]   - kern.vt.fb.default_mode
kernel: info: [drm] Connector VGA-1: get mode from tunables:
kernel: info: [drm]   - kern.vt.fb.modes.VGA-1
kernel: info: [drm]   - kern.vt.fb.default_mode
kernel: info: [drm] Connector SVIDEO-1: get mode from tunables:
kernel: info: [drm]   - kern.vt.fb.modes.SVIDEO-1
kernel: info: [drm]   - kern.vt.fb.default_mode
kernel: composite sync not supported
kernel: fbd0 on drmn0
kernel: VT: Replacing driver "vga" with new "fb".

20170425 https://www.youtube.com/watch?v=VWUpyCsUKR4
20161221 https://www.youtube.com/watch?v=IbCHE-hONow
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